Flutter Unable to update List<Map<>> datatable onSelectChanged - list

Question

Please help - and be patient i am still learning - I have a model with constant data (until I implement my API) that provides Order data
class Orders {
static const List<String> columns = [
"ID",
"Items",
"Total",
"Status",
];
List<Map<int,String>> header = [
{0:"Order"},
{1:"Items"},
{2:"Total"},
{3:"Status"},
];
List<Map<String,dynamic>> rows = [
{"Number":390,"Items":6,"Total":450.00,"Status":"PENDING","Checked":true},
{"Number":391,"Items":19,"Total":3200.00,"Status":"PENDING","Checked":false},
{"Number":392,"Items":6,"Total":450.00,"Status":"PENDING","Checked":false},
{"Number":393,"Items":"-","Total":"-","Status":"-","Checked":false},
];
void setOrderHeader(newHeader){
header = newHeader;
}
void setOrderRows(newRows){
rows = newRows;
}
}
I then created a DataTable builder which i call on my orders_screen
import 'package:flutter/material.dart';
import 'package:one/models/orders.dart';
class DataTableBuilder extends StatefulWidget {
#override
_DataTableBuilderState createState() => _DataTableBuilderState();
}
class _DataTableBuilderState extends State<DataTableBuilder> {
List<Map<int, String>> get header => Orders().header;
List<Map<String, dynamic>> get rows => Orders().rows;
int sortColumnIndex = 0;
bool sort = true;
String rowKey = "Number";
#override
void initState() {
super.initState();
}
#override
Widget build(BuildContext context) {
int col = 0;
return SingleChildScrollView(
scrollDirection: Axis.vertical,
child: DataTable(
sortAscending: sort,
sortColumnIndex: sortColumnIndex,
showCheckboxColumn: true,
columns: header.map((e) => DataColumn(
label: _getStyledText(e[col++]!.toUpperCase(),14,Colors.black),
),
).toList(),
rows: rows.map(((rowData) => DataRow(
cells: <DataCell>[
DataCell(
_getStyledText(
rowData["Number"],
12,
Colors.black87,
),
), //Extracting from Map element the value
DataCell(
_getStyledText(
rowData["Items"],
16,
Colors.black87,
),
),
DataCell(
_getStyledText(
rowData["Total"],
12,
Colors.black87,
),
),
DataCell(
_getStyledText(
rowData["Status"],
12,
Colors.deepOrange,
),
// showEditIcon:true,
placeholder: true,
),
],
selected: rowData["Checked"],
onSelectChanged: (selected) {
if (selected==true) {
onSelectedRow(selected!, rowData,rows);
print(rows);
}
},
)),
).toList(),
),
);
}
Widget _getStyledText(dynamic rowText,double size, Color bgColor) {
return Text(
rowText.toString(),
style: TextStyle(
fontSize: size==0?14:size,
color: bgColor,
),
);
}
onSelectedRow(bool selected, Map<String,dynamic> rowData,List<Map<String,dynamic>> rows) async {
if (selected) {
for(int i = 0; i < rows.length; i++) {
if(rows[i]["Number"] == rowData["Number"]){
setState(() {
rows[i]["Checked"] = true;
Orders().setOrderRows(rows);
});
}
}
}
}
}
The issue I am having is with the onSelectChanged() and setState() methods - I would like to update the orders list to set the selected row to be checked or unchecked.
I am able to update the order data in the onSelectedRow() method but it does not seem to update my global rows variable or the setState() method is not updating the table.